Dual graphic cards aka SLI require a SLI Power Supply. This is a good option if you want to start building a new system. Another option is just to get the new Nvidia 280 graphic card. Check out Tomshardware.com for a killer article on the latest graphic cards.

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check for the clock speed of your old ram....
check for the type(DDR/DDR2/DDR3)..
check your motherboard for capability to adapt greater capacity of new RAM....
buy a new one with same specifications but of greater capacity....
replace it with the old one or you can plug it to the empty slot if found any on the board....

the problem may be ram memory and motherboard battry (cell).remove your ram and clean it and restore back.remove your motherboard cell and start computer without cell.if computer work fine and problem is solved then restore cell back and start computer again.